Orthogonal frequency division multiplex demodulation

Details Orthogonal frequency division multiplex demodulation Orthogonal frequency division multiplex demodulation

1994-07-27

1996-04-09

Chin, Wellington

Multiplex communications

Wide area network

Packet switching

375326, H04J 1100

Patent

active

055068367

ABSTRACT:
An orthogonal frequency division multiplex (OFDM) demodulation apparatus which accurately reproduces a clock and accurately generates a time window for discrete Fourier transformation (DFT) for stable demodulation of an OFDM modulated signal, wherein a clock reproduction circuit of the OFDM demodulation apparatus includes a Costas computation circuit and processes a signal corresponding to the specific carrier wave signal of a predetermined single wave for each symbol out of the I and Q channel signals obtained by subjecting the OFDM modulated signal to DFT to generate a control voltage using the Costas computation circuit and low pass filters and operates a voltage control oscillator to reproduce a clock signal. The clock signal is divided to produce the time window signals used in the DFT circuit.

REFERENCES:
patent: 5191576 (1993-03-01), Pommier et al.
patent: 5228025 (1993-07-01), Le Floch et al.
patent: 5406551 (1995-04-01), Saito et al.

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